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1. [Amps] L4B Caution (score: 1): Author: Ed K0KL <edk0kl@centurytel.net>; Date: Thu, 25 Jul 2013 12:32:13 -0500; I had a bad experience when working on an L4B for a pal. The bleeder resistor mounting scheme proved to be a little poor (unusual for Drake). When reinstalled, one of the resistors shorted to the mou; /archives//html/Amps/2013-07/msg00069.html (7,747 bytes)
2. Re: [Amps] L4B Caution (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 25 Jul 2013 10:41:26 -0700; I suggest you remove the bleeder resistors. They serve no purpose other than to speed up the bleed down when you turn the amp off. They create a lot of unnecessary heat in the supply. - Paul KW7Y At; /archives//html/Amps/2013-07/msg00070.html (8,162 bytes)
3. Re: [Amps] L4B Caution (score: 1): Author: "Jim W7RY" <w7ry@centurytel.net>; Date: Thu, 25 Jul 2013 11:52:18 -0700; And provide the ALC voltage. If you dont use ALC (which I don't) then you can remove them. 73 Jim W7RY I suggest you remove the bleeder resistors. They serve no purpose other than to speed up the ble; /archives//html/Amps/2013-07/msg00071.html (9,229 bytes)
4. Re: [Amps] L4B Caution (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 25 Jul 2013 12:24:14 -0700; Yes, I forgot about alc, which I also don't use. - Paul 73 Jim W7RY I suggest you remove the bleeder resistors. They serve no purpose other than to speed up the bleed down when you turn the amp off.; /archives//html/Amps/2013-07/msg00072.html (9,375 bytes)
5. Re: [Amps] L4B Caution (score: 1): Author: Dave Knight <n4xyz@verizon.net>; Date: Thu, 25 Jul 2013 16:26:29 -0400; I thought it also provided bias for the tubes. I used the sting of diodes on mine. I got help from VE7RF. 73 Dave N4XYZ Sent from my iPad _______________________________________________ Amps mailing; /archives//html/Amps/2013-07/msg00073.html (10,241 bytes)
6. Re: [Amps] L4B Caution (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 25 Jul 2013 14:05:29 -0700; True, but most people like you modify them for diode bias and auto resistor bias cut off. - Paul Sent from my iPad use ALC (which I don't) then you can remove them. L4B for a pal. The bleeder resisto; /archives//html/Amps/2013-07/msg00074.html (10,554 bytes)
7. Re: [Amps] L4B Caution (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Fri, 26 Jul 2013 01:08:47 +0200; Is the ALC voltage not derived by a capacitive divider and diode from the drive voltage at the cathodes? The +120V for cut off bias coming from the bleeders are switched away by the PTT relay. 73 Pet; /archives//html/Amps/2013-07/msg00075.html (10,385 bytes)
8. Re: [Amps] L4B Caution (score: 1): Author: "Steven Grant, W4IIV" <stevengrant98@yahoo.com>; Date: Thu, 25 Jul 2013 16:11:21 -0700 (PDT); those bleeders also provide the ALC voltage, and cut off bias. STEVEN GRANT W4IIV I suggest you remove the bleeder resistors. They serve no purpose other than to speed up the bleed down when you turn; /archives//html/Amps/2013-07/msg00076.html (10,271 bytes)
9. Re: [Amps] L4B Caution (score: 1): Author: Paul Baldock <paul@paulbaldock.com>; Date: Thu, 25 Jul 2013 16:29:41 -0700; Quite right, I forgot about that. In my amp I removed the ALC and changed the bias to a string of diodes (instead of zero bias) and a 50K (instead of the120V supply) when in standby. - Paul _________; /archives//html/Amps/2013-07/msg00077.html (8,124 bytes)
10. Re: [Amps] L4B Caution (score: 1): Author: Jim Smith <jimsmith@shaw.ca>; Date: Thu, 25 Jul 2013 23:43:22 -0700; What is glass tape and what is it used for? Jim Smith VE7FO On 2013-07-25 10:32, Ed K0KL wrote: I had a bad experience when working on an L4B for a pal. The bleeder resistor mounting scheme proved to; /archives//html/Amps/2013-07/msg00078.html (8,475 bytes)
11. Re: [Amps] L4B Caution (score: 1): Author: Jim Smith <jimsmith@shaw.ca>; Date: Sat, 27 Jul 2013 00:45:03 -0700; Thanks very much for the info, guys, both here and direct. I note that in the McMaster-Carr catalogue that it is for indoor use only 73, Jim Smith VE7FO Jim Smith VE7FO On 2013-07-25 10:32, Ed K0KL w; /archives//html/Amps/2013-07/msg00082.html (9,207 bytes)

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